I got to thinking back on this post and I had a simlier problem after breaking a valve spring which in turn bent a push rod..etc...replaced this stuff and still lost 3+ tenths...it actually felt like the car gained 600 lbs.
Come to find out after pulling off the intake I wiped out a lope on the cam shaft....
it never popped skipped or anything just became real sluggish..
i'm sure by now you found it..just thought I would post this to help someone in future
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "